Improvement in apparatus for tracing drawings



C. ZWE|FEL & E. STEVENS.

Improvement in Apparatus for Tracing Drawings, &c.

Patented April 2, 1872.

PATENT QFFIGE.

CASPER ZWEIFEL AND EDWARD STEVENS, OF POMEROY, OHIO.

IMPROVEMENT IN APPARATUS FOR TRACING DRAWINGS, &c.

Specification forming part of Letters Patent No. 125,372, dated April 2, 1872.

To all whom it may concern:

Be it known that we, CASPER ZWEIFEL and EDWARD STEVENS, of Pomeroy, in the county of Meigs and State of Ohio, have invented a new and Improved Apparatus for Tracing Drawings, Pictures, 850.; and we do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawing making a part of this specification, in which- Figure l is a top view, and Fig. 2 is a sec tional elevation.

Our invention relates to an improvement in tracingboxes, provided with reflecting and transparent plates and the feature of novelty consists in the arrangement of a frame for holding or clamping the pattern, as hereinafter described.

Referring to the drawing, a is a board with a hole, I), of any desired shape and size cut through it. A glass plate, 0, is let into the surface of the board over the hole I), on which plateislaid the picture. Aframe, d, is hinged to the board at one side of the plate c,and is provided with hooks e to enter eyes f in the board, and thus fasten the frame down upon the picture and tracing-muslin. A cover, 9, is hinged to one side of the board a for the purpose of protecting the glass plate When not in use. A mirror, 1', is placed in a frame. 9', which latter is hinged to the bottom of the board a crosswise of the same. A socket, k, is secured to one side of the frame j, through which a brace, l, pivoted at its upper end to the adjacent side of the board a,is passed. A set-screw, m, entering the socket, serves to fasten it to the brace l at any desired point. By this means the angle between the glass plate and the mirror may be varied at pleasure. A shield, oz, is set in a socket at the end of the board a for the purpose of keeping the rays of light off from the muslin.

WVhat We claim is-- The hinged clamping-frame d, in combination with the transparent plate 0, as and for the purpose specified.

CASPER ZWEIFEL. EDWARD STEVENS.

Witnesses to both signatures: CHARLES F. BRANCH, SYLVnsrER OoBURN. 

